<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .page {
            width: 100vw;
            height: 200px;
            display: grid;
            grid-template-columns: 200px auto 200px;
        }

        .left,
        .right {
            height: 200px;
            background-color: aqua;

        }

        .content {
            height: 200px;
            background-color: brown;
        }
    </style>
</head>

<body>
    <div class="page">
        <div class="left"></div>
        <div class="content"></div>
        <div class="right"></div>
    </div>
</body>

</html>